Google Maps文字叠加层-Android [英] Google Maps Text Overlay - Android
问题描述
我正在尝试为Google Maps上的某些建筑物着色:
I am trying to colour some building on Google Maps like this:
我可以在建筑物顶部覆盖多边形对象,但是我不能在建筑物顶部添加标签(建筑物ID).
I am able to overlay a polygon object on top of the building but Im not able to apply a label on top of it (Building's ID).
如何使用Android将图片覆盖上图所示的建筑物?
How can overlay text on buildings like it's shown in the image above with Android?
推荐答案
我知道这个问题有点老了,但是我只是想出了如何为自己的项目做到这一点,并认为可以分享.该方法是创建文本的位图图像,然后在zIndex大于多边形的多边形上将其显示为GroundOverlay.
I know this question is a bit old, but I just figured out how to do this for my own project and thought I'd share. The method is to create a bitmap image of your text, and then display it as a GroundOverlay on your polygon with a zIndex greater than the polygon.
如果您有多边形的LatLng列表,则可以执行以下操作:
If you've got the list of LatLngs for your polygon you can do the following:
private void showText(List<LatLng> latLngList) {
LatLngBounds.Builder builder = new LatLngBounds.Builder();
for (LatLng latLng : latLngList) {
builder.include(latLng);
}
googleMap.addGroundOverlay(new GroundOverlayOptions()
.positionFromBounds(builder.build())
.image(
BitmapDescriptorFactory.fromBitmap(
getBitmapFromView()
)
)
.zIndex(100)
);
}
.zIndex(100)部分非常重要,因为您希望将文本显示在多边形上.(我实际上不确定最大z索引是多少,但100可以工作.)
The .zIndex(100) part is important since you'll want the text to be displayed over your polygon. (I'm not actually sure what the maximum z index is but 100 works).
这是将布局转换为位图的方法.
Here's the method to transform a layout into a bitmap.
private Bitmap getBitmapFromView() {
View customView = ((LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.my_text_layout, null);
customView.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
customView.layout(0, 0, customView.getMeasuredWidth(), customView.getMeasuredHeight());
customView.buildDrawingCache();
Bitmap returnedBitmap = Bitmap.createBitmap(customView.getMeasuredWidth(), customView.getMeasuredHeight(),
Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(returnedBitmap);
canvas.drawColor(Color.WHITE, PorterDuff.Mode.SRC_IN);
Drawable drawable = customView.getBackground();
if (drawable != null) {
drawable.draw(canvas);
}
customView.draw(canvas);
return returnedBitmap;
}
如果只需要文本,则布局"R.layout.my_text_layout"可以只是具有TextView的布局.
If you just want the text, then your layout 'R.layout.my_text_layout' can just be a layout with a TextView.
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